Method for manufacturing monocrystalline silicon wafer containing arced side, method for manufacturing monocrystalline silicon cell, and photovoltaic module

ABSTRACT

Provided is a method for manufacturing at least one solar cell, a method for manufacturing a monocrystalline silicon wafer and a photovoltaic module. The method for manufacturing a monocrystalline silicon wafer includes: providing a monocrystalline silicon rod; squaring the monocrystalline silicon rod to form a quasi-square silicon rod with quasi-square cross-section having an arc, a length of the arc being not less than 15 mm; slicing the quasi-square silicon rod to form at least one quasi-square silicon wafer having the arc. The method for manufacturing at least one solar cell includes: using the method described above to obtain a quasi-square silicon wafer having an arc; forming a first solar cell by processing the quasi-square silicon wafer; scribing the first solar cell to obtain a square-shaped sub-solar cell and at least one strip-shaped sub-solar cell. The above methods improve the utilization rate of the monocrystalline silicon rod and reduce production cost.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to Chinese Patent ApplicationNo. 201911268035.2, filed on Dec. 11, 2019, the content of which isincorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the technical field of photovoltaicmanufacture and, in particular, to methods for manufacturing at leastone solar cell, a monocrystalline silicon wafer therein, and aphotovoltaic module.

BACKGROUND

Photovoltaic related companies desire to reduce manufacture coststhrough the improvement of module efficiency and power generationcapacity, thus the monocrystalline silicon solar cell is selected as amainstream technique. Besides, the tendency of larger size and thinnerthickness of a silicon wafer is necessary, thereby BOS (balancing ofsystem) cost can be reduced as well.

With the development of solar cell technology, the size of the siliconwafer has become larger and larger, a diameter of a monocrystallinesilicon rod has also gradually increased, and there are more and moremonocrystalline offcut materials cut by a squaring process of themonocrystalline silicon rod, such that the utilization rate of thesilicon rod becomes lower and lower, thus making production cost fromcrystal to silicon wafer become higher and higher.

SUMMARY

In order to solve the above problems, the present disclosure provides amethod for manufacturing a monocrystalline cell and a method formanufacturing a monocrystalline silicon wafer, to improve theutilization rate of the monocrystalline silicon rod and reduceproduction cost of the monocrystalline silicon wafer.

The present disclosure provides a method for manufacturing amonocrystalline cell, the method includes: obtaining a quasi-squaresilicon wafer having at least one arc, a length of each of the at leastone arc being not less than 15 mm; forming the solar cell by processingthe quasi-square silicon wafer; and scribing the solar cell to obtain asquare-shaped sub-solar cell and at least one strip-shaped sub-solarcell, the number of the at least one strip-shaped sub-solar cell beingequal to the number of the at least one are of the quasi-square.

In an embodiment, the obtaining a quasi-square silicon wafer having atleast one arc includes: providing a monocrystalline silicon rod;squaring the monocrystalline silicon rod to obtain a quasi-squaresilicon rod with a quasi-square cross-section having the at least onearc, the length of each of the at least one are being not less than 15mm; and slicing the quasi-square silicon rod to obtain at least onequasi-square silicon wafer having the at least one arc.

In an embodiment, in the above method for manufacturing amonocrystalline silicon wafer, the at least one are includes four arcs.

In an embodiment, in the above method for manufacturing amonocrystalline silicon wafer, a diameter of the monocrystalline siliconrod ranges from 230 mm to 305 mm.

In an embodiment, in the above method for manufacturing amonocrystalline cell, the cell wafer is cut by a laser scribingtechnique.

In an embodiment, in the above method for manufacturing amonocrystalline cell, the square-shaped sub-solar cell has a side lengthof 158.75 mm, and the strip-shaped sub-solar cell has a length of 95 mmand a width of 25 mm.

In an embodiment, in the above method for manufacturing amonocrystalline cell, the square-shaped sub-solar cell has a side lengthof 182 mm, and the strip-shaped sub-solar cell has a length of 125 mmand a width of 20 mm.

In an embodiment, in the above method for manufacturing amonocrystalline cell, the square-shaped sub-solar cell has a side lengthof 210 mm, and the strip-shaped sub-solar cell has a length of 158.75 mmand a width of 20 mm.

In an embodiment, in the above method for manufacturing amonocrystalline cell, the square-shaped sub-solar cell has a side lengthof 182 mm and the strip-shaped sub-solar cell has a length of 140 mm anda width of 23 mm.

The present disclosure further provides a photovoltaic module, includingat least one solar cell string including a plurality of sub-solar cells,wherein the plurality of sub-solar cells are formed from a plurality ofsolar cells, and each of the plurality of solar cells is manufacturedusing a quasi-square silicon wafer having at least one arc, a length ofeach of the at least one are being not less than 15 mm.

In an embodiment, each of the plurality of solar cells is scribed toobtain a square-shaped sub-solar cell and at least one strip-shapedsub-solar cell, the number of the at least one strip-shaped sub-solarcell being equal to the number of the at least one arc of thequasi-square silicon wafer.

In an embodiment, the least one solar cell string include a first solarcell string includes composed of a plurality of the square-shapedsub-solar cells arranged along a first direction to form a first solarcell string; and the photovoltaic module includes a plurality of thefirst solar cell strings arranged along a second direction.

In an embodiment, the least one solar cell string include a second solarcell string composed of the solar cell includes a plurality ofstrip-shaped sub-solar cells arranged along a first direction to form asecond solar cell string; and the photovoltaic module includes aplurality of the second solar cell strings arranged along a seconddirection.

In an embodiment, the least one solar cell string include a first solarcell string composed of the square-shaped sub-solar cells arranged alonga first direction and a second solar cell string composed of thestrip-shaped sub-solar cells arranged along the first direction; and thephotovoltaic module includes a plurality of the first solar cell stringsarranged along a second direction and at least one second solar cellstring arranged at an edge of the plurality of first solar cell stringsor interposed between adjacent two of the plurality of first solar cellstrings.

In an embodiment, the square-shaped sub-solar cell has a side length of182 mm, and the strip-shaped sub-solar cell has a length of 140 mm and awidth of 23 mm; and the photovoltaic module includes five first solarcell strings and one second solar cell string.

In an embodiment, the square-shaped sub-solar cell has a side length of182 mm, and each of the at least one strip-shaped sub-solar cells has alength of 125 mm and a width of 20 mm.

In an embodiment, the square-shaped sub-solar cell has a side length of210 nm, and each of the at least one strip-shaped sub-solar cells has alength of 158.75 mm and a width of 20 mm.

In an embodiment, each of the plurality of solar cells is scribed toobtain four strip-shaped sub-solar cells.

In an embodiment, each of the plurality of solar cells is scribed by alaser scribing technique.

In an embodiment, the square-shaped sub-solar cell has a side length of158.75 mm, and the strip-shaped sub-solar cell has a length of 95 mm anda width of 25 mm.

It can be seen from the above description that, as for the method formanufacturing a monocrystalline silicon wafer provided in the presentdisclosure, since it includes providing a monocrystalline silicon rodfirst, then squaring the monocrystalline silicon rod to obtain aquasi-square silicon rod with a quasi-square section having an arc, thelength of the are is not less than 15 mm, and finally slicing thequasi-square silicon rod to obtain at least one quasi-square siliconwafer having the arc, and in the method for manufacturing amonocrystalline cell provided in the present disclosure, since it usesthe quasi-square silicon wafer with an arc manufactured above, thenfabricating the silicon wafer into a cell wafer and finally scribing thecell wafer to obtain one square-shaped sub-solar cell and at least onestrip-shaped sub-solar cell, compared with the solution in the relatedart where only one square-shaped sub-solar cell can be scribed, at leastone strip-shaped sub-solar cell can be additionally obtained, and it canbe applied to shingled or spliced assemblies, which reduces the waste ofsilicon materials, thereby improving the utilization rate of themonocrystalline silicon rod and reducing the production cost ofmonocrystalline silicon wafers.

BRIEF DESCRIPTION OF DRAWINGS

In order to more clearly illustrate the embodiments of the presentdisclosure or the technical solutions in the related art, the accompanydrawings used in the description of the embodiments or the related artwill be briefly introduced below. It is appreciated that, the accompanydrawings in the following description are only embodiments of thepresent disclosure, and other drawings can be obtained by those ofordinary skill in the art from the provided drawings without creativework.

FIG. 1 is a schematic diagram of a method for manufacturing amonocrystalline silicon wafer according to some embodiments of thepresent disclosure;

FIG. 2 is a schematic diagram of using the method according to someembodiments of the present disclosure to square a monocrystallinesilicon rod;

FIG. 3 is a schematic diagram of a quasi-square silicon rod squared byusing the method provided in the present disclosure:

FIG. 4 is a schematic diagram of a method for manufacturing at least onesolar cell according to some embodiments of the present disclosure;

FIG. 5 is a front schematic structural diagram of a printing patternaccording to an embodiment of the present disclosure;

FIG. 6 is rear schematic structural diagram of the printing patternshown in FIG. 5 ;

FIG. 7 is a schematic diagram showing a cutting manner for cutting asolar cell formed by the printing pattern shown in FIG. 5 and FIG. 6 ;

FIG. 8 is a schematic diagram of a square-shaped sub-solar cell and astrip-shaped sub-solar cell obtained after scribing;

FIG. 9 is a schematic diagram of a useless cell wafer after scribing;

FIG. 10 is a schematic structural diagram of a photovoltaic moduleaccording to an embodiment of the present disclosure; and

FIG. 11 is a schematic structural diagram of a photovoltaic moduleaccording to another embodiment of the present disclosure.

DESCRIPTION OF EMBODIMENTS

The core concept of the present disclosure is to provide a method formanufacturing at least one solar cell and a monocrystalline siliconwafer, which can improve the utilization rate of a monocrystallinesilicon rod and reduce production cost of the monocrystalline siliconwafer.

The technical solutions in the embodiments of the present disclosurewill be clearly and completely described below in conjunction with theaccompanying drawings in the embodiments of the present disclosure. Itis appreciated that, the described embodiments are only a part of theembodiments of the present disclosure but not all of them. Based on theembodiments of the present disclosure, all other embodiments obtained bythose of ordinary skill in the art without creative work shall fallwithin the protection scope of the present disclosure.

FIG. 1 is a flowchart illustrating an exemplary process formanufacturing a monocrystalline silicon wafer according to someembodiments of the present disclosure, including the following steps:

S1: providing a monocrystalline silicon rod;

In some embodiments, the monocrystalline silicon rod may be prepared bya Czochralski (Cz) process and/or a floating zone (Fz) process.

S2: squaring the monocrystalline silicon rod, to obtain a quasi-squaresilicon rod with a cross-section being a quasi-square having an are, anda length of the arc is not less than 15 mm;

Referring to FIG. 2 , FIG. 2 is a schematic diagram of squaring themonocrystalline silicon rod according to some embodiments of the presentdisclosure. A circular outline in FIG. 2 is an outline of themonocrystalline silicon rod, while a square outline in the interiorthereof is a conventional squaring position where only a conventionalsquare silicon block is obtained, and surrounding silicon materials areall wasted. However, four dashed lines in FIG. 2 indicate a squaringposition adopted by the method provided in the present disclosure, andan alternative solution is that a side length of the dashed lines of thesquaring equals to a side length of the conventional internal squaresilicon block outline pluses a width of a long silicon block pluses 1.5mm to 2.5 mm, it can be seen that the squaring position provided in thepresent disclosure has moved a certain distance outwards on the basis ofthe existing method, so that the monocrystalline offcut removed is muchless than the conventional squaring method, and the quasi-square siliconrod obtained by this method is as shown in FIG. 3 . FIG. 3 is aschematic diagram of a quasi-square silicon rod obtained throughsquaring by using the method provided in the present disclosure, and itcan be seen that the quasi-square silicon rod 3 has arcs 301 and alength of the arc 301 is not less than 15 mm. FIG. 3 schematically showsfour arcs 301, but in fact it is not limited to four, which is notlimited herein. The arc of this length is longer than that in therelated art, so it can be ensured that the long silicon wafer can befinally cut out from an edge position, and waste of the offcut of thesilicon material is reduced.

S3: slicing the quasi-square silicon rod, to obtain at least onequasi-square silicon wafer with an arc.

It should be noted that after the slicing process, the obtainedquasi-square silicon wafer with the above-mentioned arc becomes afinished product, and it can be made into a cell through a cellmanufacturing process.

According to the above description, in the method for manufacturing themonocrystalline silicon wafer provided in the present disclosure, sinceit includes providing a monocrystalline silicon rod first, then squaringthe monocrystalline silicon rod to obtain a quasi-square silicon rodwith a quasi-square cross-section having an arc, the length of the areis not less than 15 mm, and finally slicing the quasi-square silicon rodto obtain at least one quasi-square silicon wafer with arcs, then thequasi-square silicon wafer is made into a solar cell and finally thesolar cell is scribed to obtain one square-shaped sub-solar cell and atleast one strip-shaped sub-solar cell. Compared with the solution in therelated art where only one square-shaped sub-solar cell can be scribed,at least one strip-shaped sub-solar cell can be additionally obtained bythe present disclosure. The strip-shaped sub-solar cell can be appliedto shingled or spliced assemblies, which reduces the waste of siliconmaterials, thereby improving the utilization rate of the monocrystallinesilicon rod and reducing the production cost of monocrystalline siliconwafers.

In a specific embodiment of the method for manufacturing themonocrystalline silicon wafer, the number of the arcs can be four. Inthis case, one long strip-shaped cell can be respectively obtained atpositions of the four edges, so as to maximize the resource utilizationand better avoid the waste of the offcut of the silicon material.Different numbers of arcs can be set according to diameters of actualmonocrystalline silicon rods. Here, long strip-shaped silicon blockshaving different widths can be obtained according to the diameters ofdifferent monocrystalline silicon rods. In some embodiments, a diameterof a monocrystalline silicon rod ranges from 230 mm to 305 mm.

The above method will be described with five examples below. Theseexamples all have four arcs, that is, four long strip-shaped siliconrods can be obtained at the same time respectively for these examples.

(1) When the diameter of the monocrystalline silicon rod is 255.42 mm,the length of an opposite side of the obtained intermediate square rodis 224.75 mm, the final square silicon wafer has the side length of158.75 mm, the strip-shaped silicon wafer has a length of 125 mm and awidth of 32 mm, and the material utilization rate is 77.6%;

(2) When the diameter of the monocrystalline silicon rod is 261.77 mm,the length of the opposite side of the obtained intermediate square rodis 232 mm, the final square silicon wafer has a side length of 166 mm,the long strip-shaped silicon wafer has a length of 125 mm and a widthof 32 mm, and the material utilization rate is 79.0%;

(3) When the diameter of the monocrystalline silicon rod is 265.29 mm,the length of the opposite side of the obtained intermediate square rodis 236 mm, the final square silicon wafer has a side length of 170 mm,the long strip-shaped silicon wafer has a length of 125 mm and a widthof 32 mm, and the material utilization rate is 78.4%;

(4) When the diameter of the monocrystalline silicon rod is 301.17 mm,the length of the opposite side of the obtained intermediate square rodis 276 mm, the final square silicon wafer has a side length of 210 mm,the long strip-shaped silicon wafer has a length of 125 mm and a widthof 32 mm, and the material utilization rate is 82.3%; and

(5) When the diameter of the monocrystalline silicon rod is 305 mm, thelength of the opposite side of the obtained intermediate square rod is262 mm, the final square silicon wafer has a side length of 210 mm, thelong strip-shaped silicon wafer has a length of 158.75 mm and a width of25 mm, and the material utilization rate is 82.1%.

FIG. 4 is a schematic diagram of a method for manufacturing at least onesolar cell according to some embodiments of the present disclosure. Themethod includes following steps:

A1: Manufacturing a quasi-square silicon wafer with an arc, for example,using the method illustrated in FIG. 1 or FIG. 2 ;

The quasi-square silicon wafer with the arc is larger than a squaresilicon wafer in the conventional silicon slicing manner illustrated inFIG. 2 , and the resource utilization rate of the silicon rod is higherfor the quasi-square rod obtained via the method illustrated in FIG. 1or FIG. 2 .

A2: Manufacturing the quasi-square silicon wafer into a solar cell;

The solar cell manufacturing processes can be used to fabricate thesilicon wafer into the solar cell. For example, the silicon wafer can beprocessed to the solar cell (e.g., PERC, IBC, HIJ, TOPCon, etc.) via oneor more preparation process, such as texturing, dopant diffusing,passivating, metallizing. The solar cell may be a passivated emitterrear cell (PERC), an interdigitated back contact (IBC) cell, a tunneloxide passivated contact (Topcon) cell, a heterojunction with intrinsicthin-film (HJT) cell, and the like.

A3: Scribing the solar cell to form one square-shaped sub-solar cell andat least one strip-shaped sub-solar cell.

For example, the solar cell can be scribed to obtain four strip-shapedsub-solar cells and one squared-shaped sub-solar cell as illustrated inFIG. 5 . It should be noted that the number of the stripe-shapedsub-solar cells can be not limited herein, such as one, two, or three.

Referring to FIG. 5 and FIG. 6 , an embodiment of the present disclosureprovides a printing pattern capable of printing the quasi-square siliconwafer into a square-shaped sub-solar cell and at least one strip-shapedsub-solar cell. That is, there is no need to separately print a squaresilicon wafer and a strip silicon wafer, which simplifies themanufacturing process of the solar cell and improves the productionefficiency. As shown in FIG. 5 and FIG. 6 , the printing patternincludes a square printing portion and a strip printing portionsurrounding the square printing portion. A front side of the squareprinting portion includes a front main grid 3 and a front auxiliary grid4, a rear side of the square printing portion includes a rear main grid7, and the rear main grid 7 corresponds to the front main grid 3. Afront side of the strip printing portion includes a front first maingrid 1, a front second main grid 2 and a front auxiliary grid 4, a rearside of the strip printing portion includes a rear first main grid 5 anda rear second main grid 6, and the rear first main grid 5 and the rearsecond main grid 6 correspond to the front first main grid 1 and thefront second main grid 2, respectively.

FIG. 7 shows the square-shaped sub-solar cell 501 and the strip-shapedsub-solar cell 502 manufactured by the printing pattern shown in FIG. 5and FIG. 6 . The square-shaped sub-solar cell 501 corresponds to thesquare printing portion, and the strip printing portion corresponds tothe strip-shaped sub-solar cell 502.

FIG. 8 is a schematic diagram of a square-shaped sub-solar cell and astrip-shaped sub-solar cell obtained after scribing. It can be seen thatafter the scribing, one square-shaped sub-solar cell 501 and fourstrip-shaped sub-solar cells 502 are obtained. The strip-shapedsub-solar cell 502 can be used in shingle photovoltaic module orsplicing photovoltaic module, so as to utilize the silicon materialsmore efficiently. A wasted silicon wafer after the scribing is shown inFIG. 9 , FIG. 9 is a schematic diagram of the cell wafer after thescribing. It can be seen that the amount of the wasted silicon wafer ismuch smaller than that in methods of the conventional silicon slicingmanner, thereby the silicon materials may be saved and the productioncosts may be reduced.

In some embodiments, a laser scribing may be used to scribe the solarcell, and the laser scribing has higher accuracy and higher efficiency.It is should be noted that various scribing techniques can be usedaccording to actual needs, and not be limited herein.

In some embodiments, if the monocrystalline silicon rod is 230 mm, theside length of the obtained square-shaped sub-solar cell is 158.75 mm,and the strip-shaped sub-solar cell has a length of 95 mm and a width of25 mm, such that an area of the strip-shaped sub-solar cell that issubsequently scribed out can be maximized, so as to maximize theutilization rate of the monocrystalline silicon rod.

In some embodiments, if the monocrystalline silicon rod is 283 mm, theside length of the obtained square-shaped sub-solar cell is 182 mm, andthe strip-shaped sub-solar cell has a length of 125 mm and a width of 20mm. Such dimensions of the square-shaped sub-solar cell and thestriped-shaped sub-solar cell can be manufactured and compatible usingexisting production line. These square-shaped sub-solar cells and thestriped-shaped sub-solar cells can be combined to form the shingledphotovoltaic module.

In some embodiments, if the monocrystalline silicon rod is 297 mm, theside length of the obtained square-shaped sub-solar cell is 210 mm, andthe strip-shaped sub-solar cell has a length of 158.75 mm and a width of20 mm. Such dimensions of the square-shaped sub-solar cell and thestriped-shaped sub-solar cell can be manufactured and compatible usingexisting production line. These square-shaped sub-solar cells and thestriped-shaped sub-solar cells can be combined to form the shingledphotovoltaic module.

As shown in FIG. 10 or FIG. 11 , some embodiments of the presentdisclosure provide a photovoltaic module, the photovoltaic moduleincludes the solar cell manufactured according to any one of the abovemethods described in the president disclosure. In the presentdisclosure, a first direction is defined as perpendicular to a seconddirection. For example, the first direction may be a length direction ofthe photovoltaic module, and the second direction may be a widthdirection of the photovoltaic module.

In an embodiment, the solar cell includes a plurality of square-shapedsub-solar cells 501 arranged along the first direction to form a firstsolar cell string 01. The photovoltaic module includes a plurality offirst solar cell strings 01 arranged along the second direction. Thefirst solar cell strings 01 are electrically connected to each otherthrough a serial connection and/or a parallel connection.

In another embodiment as shown in FIG. 10 , the solar cell includes aplurality of strip-shaped sub-solar cells 502 arranged along the firstdirection to form a second solar cell string 02. The photovoltaic moduleincludes a plurality of second solar cell strings 02 arranged along thesecond direction. The second solar cell strings 02 are electricallyconnected to each other through a serial connection and/or a parallelconnection. For example, 60 strip-shaped sub-solar cells 502 arearranged along the first direction (the width direction of thestrip-shaped sub-solar cell 502) to form a photovoltaic module of 6*60.

In still another embodiment as shown in FIG. 11 , the solar cellincludes both a plurality of square-shaped sub-solar cells 501 arrangedalong the first direction to form a first solar cell string 01 and aplurality of strip-shaped sub-solar cells 502 arranged along the firstdirection to form a second solar cell string 02. The photovoltaic moduleincludes a plurality of first solar cell strings 01 arranged along thesecond direction and at least one second solar cell string 02 arrangedclose to the edge of the first solar cell string 01 or interposedbetween two first solar cell strings 01. That is, the second solar cellstring 02 may be arranged close to the upper edge (see FIG. 8 ) or thelower edge of the first solar cell string 01, and the second solar cellstring 02 may also be arranged between two first solar cell strings 01,as long as the first solar cell strings 01 and the second solar cellstrings 02 can be combined along the second direction into apredetermined shape. Through filling the gap between the first solarcell strings 01, which is insufficient to place any more first solarcell string 01, by the second solar cell strings 02, the filling rate ofthe solar cell can be improved without increasing the total dimension ofthe photovoltaic module, so that the efficient power generation area canbe increased to achieve the purpose of improving the power generationefficiency with reduced cost. For example, the square-shaped solar cell501 has a side length of 182 mm, and the strip-shaped solar cell 502 hasa length of 140 mm and a width of 23 mm. The photovoltaic moduleincludes 5 first solar cell strings 01 and 1 second solar cell string02, the second solar cell string 02 is arranged close to the upper edgeof the first solar cell strings 01, so that the dimension of thephotovoltaic module along the second direction will be 182*5+140=1050mm, such dimension is the same as the dimension of 5 columns ofsquare-shaped sub-solar cells 501 arranged in the second direction, butwith less large-scale crystal rod consumed and with less device cost,while further improving the utilization rate of the crystal rod.

In some embodiments, the second solar cell string 02 may be arrangedbetween any adjacent first solar cell strings 01, and the number of thesecond solar cell string 02 cannot be limited herein.

The above description of the disclosed embodiments enables those skilledin the art to implement or use the present disclosure. Variousmodifications to these embodiments will be obvious to those skilled inthe art, and general principles defined herein can be implemented inother embodiments without departing from the spirit or scope of thepresent disclosure. Therefore, the present disclosure will not belimited to the embodiments shown here but should conform to the widestscope consistent with the principles and novel features disclosedherein.

What is claimed is:
 1. A method for manufacturing at least one solarcell, comprising: obtaining a quasi-square silicon wafer having at leastone arc, a length of each of the at least one arc being not less than 15mm; forming the at least one solar cell by processing the quasi-squaresilicon wafer; and scribing the at least one solar cell to obtain asquare-shaped sub-solar cell and at least one strip-shaped sub-solarcell, a number of the at least one strip-shaped sub-solar cell beingequal to a number of the at least one arc of the quasi-square, whereinobtaining a quasi-square silicon wafer having at least one arc includes:providing a monocrystalline silicon rod; squaring the monocrystallinesilicon rod to form a quasi-square silicon rod with a quasi-squarecross-section having the at least one arc, the length of each of the atleast one arc being not less than 15 mm; and slicing the quasi-squaresilicon rod to form the at least one quasi-square silicon wafer havingthe at least one arc.
 2. The method for manufacturing at least one solarcell according to claim 1, wherein the at least one arc comprises fourarcs.
 3. The method for manufacturing at least one solar cell accordingto claim 1, wherein a diameter of the monocrystalline silicon rod rangesfrom 230 mm to 305 mm.
 4. The method for manufacturing at least onesolar cell according to claim 1, wherein the at least one solar cell isscribed by a laser scribing technique.
 5. The method for manufacturingat least one solar cell according to claim 1, wherein the square-shapedsub-solar cell has a side length of 158.75 mm, and the at least onestrip-shaped sub-solar cell each has a length of 95 mm and a width of 25mm.
 6. The method for manufacturing at least one solar cell according toclaim 1, wherein the square-shaped sub-solar cell has a side length of182 mm, and the at least one strip-shaped sub-solar cell each has alength of 125 mm and a width of 20 mm.
 7. The method for manufacturingat least one solar cell according to claim 1, wherein the square-shapedsub-solar cell has a side length of 210 mm, and the at least onestrip-shaped sub-solar cell each has a length of 158.75 mm and a widthof 20 mm.
 8. The method for manufacturing at least one solar cellaccording to claim 1, wherein the square-shaped sub-solar cell has aside length of 182 mm, and the at least one strip-shaped sub-solar celleach has a length of 140 mm and a width of 23 mm.
 9. A photovoltaicmodule, comprising: at least one solar cell string including a pluralityof sub-solar cells, wherein the plurality of sub-solar cells are formedfrom a plurality of solar cells, and each of the plurality of solarcells is manufactured using a quasi-square silicon wafer having at leastone arc, a length of each of the at least one arc being not less than 15mm, wherein each of the plurality of solar cells is scribed to obtain asquare-shaped sub-solar cell and at least one strip-shaped sub-solarcell, a number of the at least one strip-shaped sub-solar cell beingequal to a number of the at least one arc of the quasi-square siliconwafer.
 10. The photovoltaic module according to claim 9, wherein the atleast one solar cell string comprise a first solar cell string composedof the square-shaped sub-solar cells arranged along a first direction toform; and the photovoltaic module comprises a plurality of the firstsolar cell strings arranged along a second direction.
 11. Thephotovoltaic module according to claim 9, wherein the at least one solarcell string comprise a second solar cell string composed of thestrip-shaped sub-solar cells arranged along a first direction to form asecond solar cell string; and the photovoltaic module comprises aplurality of the second solar cell strings arranged along a seconddirection.
 12. The photovoltaic module according to claim 9, wherein theat least one solar cell string comprise a first solar cell stringcomposed of the square-shaped sub-solar cells arranged along a firstdirection and a second solar cell string composed of the strip-shapedsub-solar cells arranged along the first direction; and the photovoltaicmodule comprises a plurality of the first solar cell strings arrangedalong a second direction and at least one second solar cell stringarranged at an edge of the plurality of first solar cell strings orinterposed between adjacent two of the plurality of first solar cellstrings.
 13. The photovoltaic module according to claim 9, wherein thesquare-shaped sub-solar cell has a side length of 182 mm, and thestrip-shaped sub-solar cell has a length of 140 mm and a width of 23 mm;and the photovoltaic module comprises five first solar cell strings andone second solar cell string.
 14. The photovoltaic module according toclaim 9, wherein the square-shaped sub-solar cell has a side length of182 mm, and each of the at least one strip-shaped sub-solar cells has alength of 125 mm and a width of 20 mm.
 15. The photovoltaic moduleaccording to claim 9, wherein the square-shaped sub-solar cell has aside length of 210 mm, and each of the at least one strip-shapedsub-solar cells has a length of 158.75 mm and a width of 20 mm.
 16. Thephotovoltaic module according to claim 9, wherein each of the pluralityof solar cells is scribed to obtain four strip-shaped sub-solar cells.17. The photovoltaic module according to claim 9, wherein each of theplurality of solar cells is scribed by a laser scribing technique. 18.The photovoltaic module according to claim 9, wherein the square-shapedsub-solar cell has a side length of 158.75 mm, and the strip-shapedsub-solar cell has a length of 95 mm and a width of 25 mm.